Well, it is just about that time of year again: flu season. No one is really ever ready for it, but it is better to be prepared early than to catch the flu and regret it later. The flu is a type of contagious respiratory illness that is caused by influenza viruses. Most of the time it is a mild illness, but in some cases it can be more severe and at times even cause death. The best way to prevent against the seasonal flu is by getting a seasonal flu vaccination annually.
Each year, on average, in the United States: